Zhongke KingDa specializes in measurement and control research in the field of industrial control. In terms of acoustic measurement and control, we provide customers with a series of solutions for product acoustic performance testing and product research and development acoustic evaluation, including semi-anechoic chambers, full-anechoic chambers, and online A full range of solutions including silent rooms, sound insulation rooms, acoustic equipment, measurement methods and acoustic testing.
Online anechoic room of refrigerators, freezers and other home appliances:
The online anechoic room can be designed into a straight or curved type according to the assembly line. In the anechoic room, you can monitor or test whether the noise of the refrigerator exceeds the standard. Since the online anechoic chamber is built on the assembly line, the non-stop assembly line is used for human ear monitoring (subjective evaluation). The two ends of the online anechoic chamber are always open for the inlet and outlet. Because of the huge sound leakage, the design requires online anechoic Both ends of the sound chamber are designed with silencing sound loops (silencing channels), so that the ambient noise inside the online anechoic chamber is controlled within the indicators that are easy to judge whether the refrigerator noise exceeds the standard.
Acoustic performance indicators:
1.1. Measured object: Judgment of the operating noise of the refrigerator on the production line after it is energized.
1.2. Measurement method: manual monitoring method (subjective evaluation).
1.3. Type of anechoic room: linear online silent room.
1.4. Standards for anechoic room: ISO 3745, GB6882-2008 and GB/T4214.1-2000.
1.5. Background noise: ≤45dBA at the detection station of the online silent room (determined according to the customer's on-site time and environmental conditions), or the difference between indoor and outdoor sound levels is 20dBA.
1.6. Analyze the frequency range: 20Hz—20000Hz (the human ear can recognize the sound frequency range).
1.7. Product under test: direct cooling/air cooling refrigerator.